// 打印类属性、方法定义
/* eslint-disable */

class Print {
  dom = null;

  options = {};

  constructor(dom, options = {}) {
    // if (!(this instanceof Print)) return new Print(dom, options)

    this.options = this.extend({ noPrint: ".no-print" }, options);

    if (typeof dom === "string") {
      try {
        this.dom = document.querySelector(dom);
      } catch {
        this.dom = document.createElement("div");
        this.dom.innerHTML = dom;
      }
    } else {
      this.isDOM(dom);
      this.dom = this.isDOM(dom) ? dom : dom.$el;
    }

    this.init();
  }

  init() {
    this.writeIframe(this.getStyle() + this.getHtml());
  }

  extend(obj, obj2) {
    for (let key in obj2) {
      obj[key] = obj2[key];
    }
    return obj;
  }

  getStyle() {
    let str = "",
      styles = document.querySelectorAll("style,link");
    for (let i = 0; i < styles.length; i++) {
      str += styles[i].outerHTML;
    }
    str +=
      "<style>" +
      (this.options.noPrint ? this.options.noPrint : ".no-print") +
      "{ display: none; }</style>";
    str += "<style>html, body{ background-color: #fff; }</style>";
    return str;
  }

  getHtml() {
    const inputs = document.querySelectorAll("input");
    const textAreas = document.querySelectorAll("textarea");
    const selects = document.querySelectorAll("select");

    for (let k = 0; k < inputs.length; k++) {
      if (inputs[k].type === "checkbox" || inputs[k].type === "radio") {
        if (inputs[k].checked === true) {
          inputs[k].setAttribute("checked", "checked");
        } else {
          inputs[k].removeAttribute("checked");
        }
      } else if (inputs[k].type === "text") {
        inputs[k].setAttribute("value", inputs[k].value);
      } else {
        inputs[k].setAttribute("value", inputs[k].value);
      }
    }

    for (let k = 0; k < textAreas.length; k++) {
      if (textAreas[k].type === "textarea") {
        textAreas[k].innerHTML = textAreas[k].value;
      }
    }

    for (let k = 0; k < selects.length; k++) {
      if (selects[k].type === "select-one") {
        let child = selects[k].children;
        for (let i in child) {
          if (child[i].tagName === "OPTION") {
            if (child[i].selected === true) {
              child[i].setAttribute("selected", "selected");
            } else {
              child[i].removeAttribute("selected");
            }
          }
        }
      }
    }

    return this.dom.outerHTML;
  }

  writeIframe(content) {
    let w,
      doc,
      iframe = document.createElement("iframe"),
      f = document.body.appendChild(iframe);
    iframe.id = "myIframe";
    iframe.setAttribute(
      "style",
      "position:absolute; width:0; height:0; top:-10px; left:-10px;",
    );
    w = f.contentWindow ?? f.contentDocument;
    doc = f.contentDocument ?? f.contentWindow.document;
    doc.open();
    doc.write(content);
    doc.close();
    const _this = this;
    iframe.onload = () => {
      _this.toPrint(w);
      setTimeout(() => {
        document.body.removeChild(iframe);
      }, 100);
    };
  }

  toPrint(frameWindow) {
    try {
      setTimeout(() => {
        frameWindow.focus();
        try {
          if (!frameWindow.document.execCommand("print", false, null)) {
            frameWindow.print();
          }
        } catch (e) {
          frameWindow.print();
        }
        frameWindow.close();
      }, 10);
    } catch (err) {
      console.log("err", err);
    }
  }

  isDOM(obj) {
    return typeof HTMLElement === "object"
      ? obj instanceof HTMLElement
      : obj &&
          typeof obj === "object" &&
          obj.nodeType === 1 &&
          typeof obj.nodeName === "string";
  }
}

export default Print;
